Ever since I got this car I have been having trouble with the speedometer. It usually works for a while after start up until something knocks it loose. I have sourced the problem to the bulb that you plug into the back cluster. Basically if I out my hand on this bulb and press it into the cluster hard when I am driving it works, and stays working until I hit a bump or something seems to jar it loose. The bulb seems to be soldered into place and is not burn out. Are my wires just bad and need to be replaced or do I need a new bulb?
Any help would be greatly appreciated.
Pics for clarity:
The "bulb"

And it Plugs into the hole on the far right side in this pic:
Any help would be greatly appreciated.
Pics for clarity:
The "bulb"

And it Plugs into the hole on the far right side in this pic:
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